If you’re a cheese lover, I can highly recommand La Käserie, a French cheese shop close to U Eberswalder Straße, I often go buy some cheese there, but you can also eat on the spot.
If you go there spontaneously, you can get breakfast, sandwiches or a cheese plate, with or without hams. They offer other specialties that have to be prebooked. Fondue, raclette or Mont d’Or, depending on the season. They also do special evenings with only one of those dishes, or tartiflette, or cheese & wine, or other stuffs, follow their FB page to be kept up to date.
They do without a single doubt the best fondue in whole Berlin (well from those I tried so far and I tried a lot), their tartiflette is also a hit and as for the raclette, great cheese and high quality charcuterie (diferent kind of hams and sausages). The staff is super friendly, they will help you choosing your wine, the venue is very small but really cosy, the prices really fair.